The sonogram is a test that looks at body organs with no radiation. It uses sound waves and can give us a 2 dimensional view of organs such as the kidney, liver, heart, and lungs. It can define spaces that are either solid or full of fluid. I can also guide large needles into an organ or near the spine, and can help define the area being cut open. Its a cheap, but useful test.
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2

15 - 30 minutes:
It's probably about 15-30 minutes, depending on whether it's transabdominal scanning or both transabdominal and transvaginal scanning and also on what the technologist sees during the exam.
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3

Very accurate:
First trimester ultrasounds are very accurate in dating a pregnancy. If the ultrasound date is more than 7 days different for the last menstrual period; the pregnancy is usually redated by the ultrasound due date.
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4

An :
An ultrasound can detect if you are pregnant, if the fetus has a heartbeat (around 7 weeks) or if it does not have a heartbeat when it should (not a viable fetus), and if your cervix is open and a miscarriage is occuring. If you had a miscarriage and all the products of conception (fetal tissue) has passed there is no way to tell "how long it's been" since the loss occurred.
Lastly, an ultrasound may not provide all the clues if read incorrectly, therefore serial blood tests to check the level of pregnancyhormone in your body will tell you exactly where you stand (pregnant or not).
I am so sorry you are going through all of this. I wish you the very best.
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8

See answer:
As a diagnostic procedure, ultrasound is a safe and painless procedure that uses sound waves to "see" inside your body and create detailed images. The wand, aka "transducer", used for diagnostic purposes does not emit heat or cause cavitation. When used as a therapeutic or treatment procedure, such as with liposuction, more powerful transducers are used which do emit heat and can cause cavitation.
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9

NO not 5 days:
In order to see gestational sac ( evidence of pregnancy need just over 30 days , blood HCG level of 1500 , how ever pregnancy test will be positive 10 days after fertilization.
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10

No chance:
No ultrasound can detect a pregnancy until the HCG ('quant') rises to at least 1500-2000, even a sensitive pregnancy test may not be completely reliable 10 days after intercourse.
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An ultrasound is an imaging study in which a probe emits and receives sound waves which rebound off of internal organs in order to visualize them. For a transvaginal ultrasound a specially designed probe is lubricated and placed into the vagina in order to better visualize pelvic organs/ structures.
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